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Property, Plant and Equipment (Property, Plant and Equipment) (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Utility:    
Generation $ 23,378 $ 22,697
Transmission 15,430 14,351
Distribution 28,953 27,311
Storage 455 436
Nuclear fuel 2,306 2,283
General and other 4,373 4,130
Plant under construction 3,898 3,350
Total utility 78,793 74,558
Non-jurisdictional - including plant under construction 1,694 1,225
Nonutility:    
Nonregulated generation-nuclear 1,773 1,736
Nonregulated generation-solar 2,026 3,268
Nuclear fuel 1,056 1,012
Other-including plant under construction 1,161 1,160
Total nonutility 6,016 7,176
Total property, plant and equipment 86,503 82,959
Virginia Electric and Power Company    
Utility:    
Generation 17,325 16,769
Transmission 11,760 11,000
Distribution 13,621 12,839
Nuclear fuel 1,702 1,709
General and other 912 845
Plant under construction 2,865 2,338
Total utility 48,185 45,500
Non-jurisdictional - including plant under construction 1,694 1,225
Nonutility:    
Other-including plant under construction 11 11
Total property, plant and equipment $ 49,890 $ 46,736